Oscillating pump



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OSCILLATING PUMP Filed Jan. 25, 1944 2 Sheets-Sheet 1 Fire! T 10 Ir 25b BY Zr; ,CM ATTORNEYS.

Oct. 10, 1944. w BACHRACH 2,359,819

OSCILLATING PUMP Filed Jan. 25, 1944 2 Sheets-Sheet 2 INVENTOR //?I//A/G W fiAcwRAcH ATTORNEYS Patented Oct. 10, 1944 UNITED STATES PATENT OFFICE 2,359,819 osomm rmo PUMP Irving-W. Bacliracli, Brooklyn, N. Y. Application January 25, 1944, Serial No. 519,609

- (see Figure 4) and has its apex side facing in- 3 Claims.

. This invention relates to improvements in pumps and has particular reference to an oscillating pump for the pumping of fluids.

. The primary object of the invention resides vision of an oscillating pump embodying a novel circulating oiling system which functions during the oscillating movements of the pump to maintain the parts thoroughly lubricated, a portion of the oiling system also functioning to form seals between the segment portions of the piston and the segment chambers in which they oscillate.

Other novel features of the invention will become apparent as the following specification is read in conjunction with the accompanying drawings; in which Figure 1 is an end elevational view of an oscillating pump constructed in accordance with my invention, the inlet and outlet pipes being shown in section.

Figure 2 is an enlarged vertical sectional View taken substantially on the line 2-2 of Figure 1, the piston being illustrated in side elevation and in a position nearing the completion of its movement in one direction.

Figure 3 is an enlarged vertical sectional view taken substantially on the lines 3-3 of Figure 1, with the piston at the limit of its movement in a direction opposite to that shown in Figure 2.

Figure 4 is a vertical transverse sectional view on the line 4-4 of Figure 2.

Referring to the drawings by reference characters, the numeral 10 designates my improved oscillating pump in its entirety which includes a cylindrical casing ll composed of a casing section l2 having one of its sides open and being supported upon a base I2. The open side'of the, casing section I2 is closed by a circular cover member Iii-which is secured to thesection i2 by bolts Hi. A sealing gasket is interposed between the cover member and the casing section to 'provide a sealed joint therebetween. The cover member i3 is of conical shape in'cross section wardly. The cover member I3 is provided with an axial bearing l5 which axially alines with an axial stepped bearing It provided in the end wall ll of the casing section 12. An oscillating shaft I8 is journalled in the bearing l5 and has its inner end journalled in the smaller bearing surface of the stepped bearing it. The outer end of the shaft It extends beyond the cover member I3 and may be operatively connected to any driven oscillatory source of power such asshown in Gideon Patent No. 1,951,607, granted March 20, 1934.

Integral with and extending inwardly from the side walls of the casing section l2 are segmental bosses i9 and 20, the same extendingthe width of the interior of the casing H. The inner ends of the bosses terminate in spaced relation and are curved on a common are concentric to the casing. The opposed sides of the boss 19 are provided with radial abutment surfaces Na and Nb and the opposed sides of the boss 20 are provided with similar abutment surfaces 2% and 20b. The bosses I9 and 29 divide the interior of the casing into segmental compartments A and B.

Fixed to the shaft l8 by key means 2| is a piston 22 which includes a hug portion 23 having a reduced hub extension 25 at one end which is journalled in the larger bearing of the stepped hearing it. That side of'the piston from which the hub extension 24 extends is flat and has wiping contact with the inner side of the end wall H. The other side of the piston 22 is concave and complementary to the, inclined surfaces of the cover member l3 and has bearing engagement therewith. Integral with'the hub portion 23 and extending in diametrically opposed relation are segment shaped piston heads 25 and 26 which are respectively disposed in the compartments A and B for oscillatory movement therein. The relative sizeof each compartment and its piston head is such that the piston head is movable over a predetermined angle of approximately sixty degrees. The piston head 25 divides the compartment A into separate compression chambers 25a and 2512; Likewise, the piston. head .26 divides the compartment B into separate compression chambers 26a and 26b.

Each compression chamber is provided with an inlet port and an outlet port, the same being arranged in horizontally alined side by side rela tion, all of said ports passing through the bosses.

boss l3. Inlet and outlet pipes 26 and 36 respectively connect with the inlet and outlet ports and inlet and outlet control check valves 3| and 32 respectively arranged therein.

The inlet port of compression. chamber 25b is designated 33 and the outlet port thereof is designated 34. Inlet and outlet pipes 35 and 36 are respectively connected to the ports 33 and 34. Control inlet and outlet check valves 31 and 38 are respectively arranged in the pipes 35 and 36.

The inlet port of the compression chamber 26a is designated 33 and the outlet port 40 to which inlet and outlet pipes 4| and 42 are respectively connected. Control inlet and outlet check valves 43 and 44 are respectively arranged in the pipes 4| and 42.

The inlet port of the compression chamber 26b is designated 45 and the outlet port thereof is designated 46. Inlet and outlet pipes 41 and 43 are respectively connected to the ports 45 and 46. Control inlet and outlet check valves 49 and 56 are respectively arranged in the pipes 41 and 48.

The limit of oscillating movement of the piston 22 is such that the respective flat ends of the segment piston heads 25 and 26 contact the respective abutment surfaces 25a-25b and 26a-26b at the end of each compression movement as illustrated in Figure 2.

In operation, assume that the piston 22 is in the position illustrated in Figure 2 wherein the piston head 25 is at the limit of its movement toward the left and the piston 26 is at the limit of its movement toward the right, The compression chambers 25a and 26bare reduced to zero in size while the compression chambers 25b and 26a are at their maximum size. During the movement of the piston to the position shown, a liquid in the form of a refrigerant gas is drawn into the enlarged chambers 25b and 25a through inlet pipes 35 and 4| respectively, the check valves 3-1 and 43 being in open position. The pistons 25 and 26 are simultaneously expelling, under pressure, charges of gas previously present in the chambers 25a and 26b, through ports 28 and 46, valves 32, 50, and-pipes 30 'and 48 respectively. As the piston 22 moves in the direction of the arrows C (Figure 3), the fluid previously drawn into chambers '25?) and 26a is simultaneously compressed and forced out through the discharge ports 34 and 46, open valves 38 and 44, and outlet pipes 36 and 42, respectively. During the compression of the fluid in the chambers 25b and 26a fresh charges of fluid are being drawn by suction into the chambers 25a and 26b, which suction causes the inlet valves 3| and 49 to open and admit fluid from the inlet pipes 29 and 41. When the piston completes its movement in the direction of the arrows C, all valves close and reverse their open and closed positions as the piston begins its movement in a reverse direction or toward the left in Figure 3, whereupon the fluid in chambers 25a and 26b are compressed and forcibly discharged through passages 28 and 46,

and fresh charges of fluid are drawn into chambers 25b and 26a, thus completing the cycle.

The surfaces of the walls of the compartments A and B with which the piston 22 contacts are lubricated and sealed during oscillating movements of the piston. A circulatory lubricating system is provided for the aforementioned purpose which includes segment shaped openings 5| and 52 in the piston heads 25 and 26 respectively which extend transversely therethrough. The

walls of the openings 5| and 52, end wall I1 and cover |3 cooperate to provide oil reservoirs 53 and 54 which communicate with each other through a passage 55 extending through the hub 23 and through the axis of the shaft l8. The outer periphery of the piston heads 25 and 25 are provided with arcuate recesses 56 and 51 respectively which communicate with the oil reservoirs 53 and 54 by means of passages 58 and 59. The companion ends of the recesses 56 and 57 are respectively connected by oil ducts 60 and BI. The ducts 60 and 6| are provided in the respective side faces of the piston as best illustrated in Figures 2 and 4. In order to compress the oil within the system during oscillating movements of the piston, there is provided an abutment 62 which isintegral with the bottom of the casing section l2 and which extends inwardly into the recess 51 of the piston head 26. The end walls 63 and 64 of the recess 51 alternately cooperate with opposite sides of the abutment 62 to alternately circulate oil through the ducts 60 and 6| during each complete oscillating movement of the piston 22. Assume that the piston 22 is in the position shown in Figure 2. As the piston head 26 moves toward the left, the oil in recess 51 will be compressed by end wall 64 causing the oil therein to be forced through duct 63 into recess 56 and reservoir 53. As the opening 59 passes abutment 62, oil from reservoir 54 will flow into that portion of the recess at the left of the abutment 62. After the piston head 26 completes its movement toward the left and begins to move toward the right the end wall 63 cooperates with the left side of the abutment 62 and forces oil from recess 51 through duct 6| into recess 56 and reservoir 53. Thus it will be understood that as the piston oscillates, all surfaces in contact with the piston are lubricated and the oil in the system is circulated or agitated by alternate compression of the oil at opposite sides of the abutment 62. 'The end wall I! of the casing section I2 is provided with an oil filling opening 65 which is normally closed by a screw plug 66.

While I have shown and described what I consider to be the preferred embodiment of my invention, I wish it to beunderstood that such changes in construction and design as come within the scope of the appended claims may be resorted to if desired without departing from the spirit of the invention.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent of the United States, is:

1. In an oscillating pump, a cylindrical casing, an oscillating piston mounted concentrically within said casing, said piston including opposed segmental shape piston heads, each piston head having an opening extending therethrough, the openings in said piston heads and end walls of said casing defining separate oil reservoirs, a pas-' sage connecting said reservoirs, an arcuate oil recess provided in the periphery of each piston head, a passage connecting each recess with the adjacent reservoir, an oil duct provided in one side of the piston extending from one end of one recess to the corresponding end of the other recess, a second oil duct provided in the other side of the piston connecting the other ends of the 2. A, pump comprising a cylinder, an oscillating shaft journalled in said cylinder axially thereof, a pair of opposed sectors extending in- 1 oil recesses provided in the peripheries of the piston heads, oil ducts in opposed sides of said piston communicating with said oil recesses, oil reservoirs within the piston heads, a communicating passage connecting said reservoirs, passages connecting the recess and reservoir of each piston head, and means for compressing the oil in one of said recesses during oscillating movement of the piston for effecting a circulation of oil alternately through the ducts from the recess and reservoir of one piston head to the recess and reservoir of the other piston head. i

3. A pump comprising a cylinder, an oscillating shaft journalled in said cylinder axially thereof, a pair of opposed sectors extending inwardly from the cylinder which divides the interior of the cylinder into two segment-shaped compartments, a piston fixed to said shaft, said piston including opposed segment piston heads respectively disposed in said compartments for reverse oscillating movements therein, each of said piston heads dividing its compartment into two separate compression chambers, fluid inlet and outlet ports opening into said chambers through the sectors, inlet and outlet valves associated with the respective inlet and outlet ports, an oil lubri-J eating system within-the piston for lubricating the contacting surfaces between the piston heads and the cylindrical casing, said system including reverse flow ducts between the piston heads, and

means operable upon oscillating. movement of the piston for alternately effecting reverse flows of oil through said ducts under pressure.

IRVING W. BACHRACH. 

